Sill block



FIG. 1 is a front elevation view of a sill block in accordance with mydesign, the rear being identical;

FIG. 2 is a side elevation view from the right side of FIG. 1, theopposite side being identical;

FIG. 3 is a top plan view of the sill block shown in FIG. 1;

FIG. 4 is a bottom plan view of the sill block shown in FIG. 1.

The ornamental design for a sill block, as shown and described.